CN102329691A

CN102329691A - Decolorizing method of rice bran first-grade oil

Info

Publication number: CN102329691A
Application number: CN 201110255496
Authority: CN
Inventors: 童舜火; 李生红; 陈金平; 王小贵
Original assignee: ZHEJIANG GALAXY PHARMACEUTICAL CO Ltd
Current assignee: Zhejiang Delekang Food Co., Ltd.
Priority date: 2011-08-25
Filing date: 2011-08-25
Publication date: 2012-01-25
Anticipated expiration: 2031-08-25
Also published as: CN102329691B

Abstract

The invention relates to a decolorizing method of rice bran first-grade oil. The decolorizing method comprises the following steps of: after obtaining crude rice bran oil from rice bran, rice skin and rice germ by squeezing or solvent extraction, pretreating the rice bran crude oil, degelatinizing, deacidifying, washing with water, mixing the treated rice bran crude oil, 6# solvent oil and activated carbon in a certain ratio, stirring at the temperature of 45-60 DEG C for 1-4 hours for decolorizing, filtering the hot mixture to remove activated carbon, desolventizing the solvent-rice bran mixed oil in a tubular thin-film evaporator, recovering solvent, and dewaxing, deodorizing and degreasing the solvent-removed rice bran oil to obtain the rice bran first-grade oil. The decolorizing method has the characteristics that the decolorizing process quality is stable; the problems that the rice bran oil decolorized with common activated clay may not reach the standard requirement and easily has color reversion are avoided; the yield of the rice bran first-grade oil is above 74% based on the treatment amount of the rice bran crude oil; after decolorizing, the color of the rice bran first-grade oil is red below 3.2 and yellow at 30, and the oil loss is low; and the production cost is low, the decolorizing effect is good and the product quality is stable.

Description

The decoloring method of rice bran first-level oil

Technical field

The present invention relates to a kind of decoloring method of rice bran first-level oil.

Background technology

Rice pollard oil contains nutritive ingredients such as abundant thiaminogen, β-Gu Zaichun, vitamin E, Supraene; In the lipid acid of Rice pollard oil is formed; Unsaturated fatty acids is more than 80%; Indispensable fatty acid (being mainly linolic acid) reaches 20%～30%, in the vegetable edible oil the inside, is the higher oil product of nutritive value; And having the SUV removed in the blood, bring high blood pressure down, the accelerate blood circulation, stimulate the secretion of people's hormone in vivo, promote human development's effect, is the edible health-care oil of praising highly the most in developed countries such as the U.S., Japan.Information such as some characteristics of relevant Rice pollard oil at number of patent application are: existingly in 200810231527.x " working method of rice bran first-level oil refinement " set forth in detail, company's more and more deep research aspect the rice bran comprehensive utilization of resources has more research to the singularity of rice bran, rice bran crude oil; Because the singularity of Rice pollard oil, the extremely difficult removal of crude oil acid value height, color and luster, wax content height, mouthfeel difference etc. are though solved in first-level oil refinement technology; But, because the color and luster of rice bran crude oil is dark, difficult treatment; Wherein contain, a fairly large number of other oil-soluble substances more complicated than other plant grease, mainly remove this part impurity through this operation of decolouring, the decolorizing effect quality directly affects the outward appearance and the ranking of Rice pollard oil; Two conventional activated decoloration methods differ and reach standard-required surely, and are prone to return look, and oily damage amount is big; Also be difficult to remove even return look oily decolouring again, can't reach specification of quality, more can't reach the quality of high-quality Rice pollard oil; Influence the oil quality outward appearance; Can't guarantee the ordinary production of rice bran first-level oil and meet the need of market that therefore, it is difficult and to return the look phenomenon easily be a technical barrier how to solve the Rice pollard oil decolouring.

Summary of the invention

The present invention is directed to the above-mentioned deficiency of returning look after being difficult in the rice bran first-level oil refinement process decolour and decolour easily; A kind of refinery practice of rice bran first-level oil is provided, adopts the solvent decolouring of discoloring agent and cooperate the solvent recuperation combination process with thin-film evaporator, its good decolorizing effect, oil decrease few; And decolouring back oil can not returned look; Improve oil quality stability, practice thrift cost, have remarkable economic efficiency.

Technical scheme

Technical solution of the present invention is: rice bran first-level oil making technology step and bleaching process are provided with as follows:

Rice bran crude oil → pre-treatment → filtration → hydration degum → depickling → washing → solvent decolouring → filtration → precipitation → winterization dewaxing → deodorization → degreasing → rice bran first-level oil

Adopt the 6# solvent oil of 10～15 times of amounts, the gac that adds oil mass 3～7% dilutes, and stirs decolouring 1～4 hour down at 45～60 ℃.Filtered while hot is removed gac, solvent---and the Rice pollard oil mixed solution pumps into thin-film evaporator and carries out the solvent recuperation precipitation, forms decoloration process with it, after dewaxing, deodorization, degreasing, gets rice bran first-level oil again.

Beneficial effect

Show that according to research as vegetable edible oil 6# solvent oil decolouring, its effect is obvious, and with gac collocation decolouring back steady quality.

The present invention is according to the strong adsorptivity of gac; Under solvent oil and the abundant dissolved state of rice bran crude oil, decolour, under 45 ℃～60 ℃ temperature, stirred 1～4 hour, filtered while hot is removed gac; In thin-film evaporator, carry out precipitation; Reclaim solvent, be combined into the Rice pollard oil decoloration process, obtain grade rice bran oil through dewaxing, deodorization, degreasing again.

Adopt Rice pollard oil solvent decoloring method of the present invention, its advantage is first: good decolorizing effect, and decolouring back steady quality; Second: the thin-film evaporator solvent recovering rate is high; The 3rd: oil decreases few, and cost is low, and is easy and simple to handle.

Embodiment

Embodiment 1:

Get 90L through pre-treatment, come unstuck, the Rice pollard oil after the depickling, washing, join in the 1000L6# solvent oil, with the 10L left and right sides Rice pollard oil 5kg gac is pulled an oar; Under agitation join solvent---in the rice bran mixing oil, be warmed up to 45 ℃ and stop heating, continue pressurization and stirred 3 hours; With this mixing oil filtered while hot, remove gac, mixing oil is squeezed into the shell and tube thin-film evaporator and is carried out precipitation; Solvent recuperation; Grease after decolouring carries out crystallisation by cooling and dewaxes, and gives deodorization again, obtains grade rice bran oil 76L after the degreasing.Obtain the grade rice bran oil color: red 2.8, yellow 30.

Embodiment 2:

Repeat the operation of embodiment 1, the solvent oil among the embodiment 1 is increased to 1200L, gac 2.5kg stirred 4 hours after temperature rises to 45 ℃, repeated subsequent handling, got rice bran first-level oil 72L at last, and its color is: red 3.1, yellow 30.

Embodiment 3:

Repeating the operation of embodiment 1, is 1500L with the solvent oil mass among the embodiment 1, and gac is 5kg, stirs 3 hours after being warming up to 45 ℃, repeats subsequent step, grade rice bran oil 76L, color is: red 2.9, yellow 30.

Embodiment 4:

Repeat embodiment 1, the 6# solvent oil among the embodiment 1 be adjusted into 800L, take by weighing gac 4kg, stirred 2 hours after being warming up to 55 ℃, repeat subsequent step, grade rice bran oil 79L, its color is: red 2.8, yellow 30.

Embodiment 5:

Repeat embodiment 1, the 6# solvent oil is got 1200L, and the making beating gac is got 6kg, stirs 3 hours after being warming up to 55 ℃, repeats subsequent step, grade rice bran oil 81L, its color is: red 2.6, yellow 30.

Embodiment 6:

Repeat embodiment 3, gac takes by weighing 6kg, stirs 2 hours after being warming up to 55 ℃, repeats subsequent step, grade rice bran oil 75L, its color is: red 2.8, yellow 30.

Claims

1. Rice pollard oil decolouring technology is characterized in that this method may further comprise the steps:

A, by technology through pre-treatment, come unstuck, rice bran crude oil after the depickling decolours;

B, described rice bran crude oil are raw material: the 6# solvent oil: the solvent decolouring is carried out in gac=100: 1000 ± 500: 4 ± 2;

C, will mix in the making beating of the gac of B ratio, join in Rice pollard oil-solvent oil mixing liquid with an amount of steps A Rice pollard oil;

D, this decolouring crude oil are 45～60 ℃ in temperature and stirred 1～4 hour down that filtered while hot is removed gac;

E, filtration rear filtrate pump into thin-film evaporator and carry out precipitation, after dewaxing, deodorization, degreasing, get rice bran first-level oil again.

2. a kind of Rice pollard oil decolouring technology as claimed in claim 1 is characterized in that said 6# solvent oil and activated carbon decolorizing, and reclaiming solvent combinations with thin-film evaporator is the Rice pollard oil decoloration process.